Remote iPhone Exploitation Part 2: Bringing Light into the Darkness -- a Remote ASLR Bypass

Posted by Samuel Groß, Project Zero This post is the second in a series about a remote, interactionless iPhone exploit over iMessage.The first blog post, which introduced the exploited vulnerability, can be found here. The initial primitive gained from the vulnerability is an absolute address...

iMessage - Decoding NSSharedKeyDictionary Can Read Object Out of Bounds Exploit

When an NSKeyedUnarchiver decodes an object, it first allocates the object using allocWithZone, and then puts the object into a dictionary for temporary objects. It then calls the appropriate initWithCoder: on the allocated object. If initWithCoder: or any method it calls decodes the same object,...

iMessage - Decoding NSSharedKeyDictionary Can Read Object Out of Bounds

iMessage - Decoding NSSharedKeyDictionary Can Read Object Out of Bounds When an NSKeyedUnarchiver decodes an object, it first allocates the object using allocWithZone, and then puts the object into a dictionary for temporary objects. It then calls the appropriate initWithCoder: on the allocated...

NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String Exploit

There is an info leak when decoding the SGBigUTF8String class using SGBigUTF8String initWithCoder:. This class initializes the string using SGBigUTF8String initWithUTF8DataNullTerminated: even though there is no guarantee the bytes provided to the decoder are null terminated. It should use...

NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String

NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String There is an info leak when decoding the SGBigUTF8String class using SGBigUTF8String initWithCoder:. This class initializes the string using SGBigUTF8String initWithUTF8DataNullTerminated: even though there is no guarantee the bytes provide...

NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String

There is an info leak when decoding the SGBigUTF8String class using SGBigUTF8String initWithCoder:. This class initializes the string using SGBigUTF8String initWithUTF8DataNullTerminated: even though there is no guarantee the bytes provided to the decoder are null terminated. It should use...

macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary I

macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances When deserializing NSObjects with the NSArchiver API 1, one can supply a whitelist of classes that are allowed to be unarchived. In that case, any object in the archive whose class is not...

macOS iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances

macOS iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances When deserializing NSObjects with the NSArchiver API 1, one can supply a whitelist of classes that are allowed to be unarchived. In that case, any object in the archive whose class is not...

iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References

iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References When deserializing a class with initWithCoder, subclasses of that class can also be deserialized so long as they do not override initWithCoder and implement all methods that require a concrete implementation...

iMessage - NSKeyedUnarchiver Deserialization Allows file Backed NSData Objects

The class NSDataFileBackedFuture can be deserialized even if secure encoding is enabled. This class is a file-backed NSData object that loads a local file into memory when the NSData bytes selector is called. This presents two problems. First, it could potentially allow undesired access to local...

macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances

When deserializing NSObjects with the NSArchiver API 1, one can supply a whitelist of classes that are allowed to be unarchived. In that case, any object in the archive whose class is not whitelisted will not be deserialized. Doing so will also cause the NSKeyedUnarchiver to "requireSecureCoding"...

iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References

When deserializing a class with initWithCoder, subclasses of that class can also be deserialized so long as they do not override initWithCoder and implement all methods that require a concrete implementation. PFArray is such a subclass of NSArray. When a PFArray is deserialized, it is deserialize...

Apple macOSiOS - Memory Corruption Due to Bad Bounds Checking in NSCharacterSet Coding for NSKeyedUnarchiver

Apple macOSiOS - Memory Corruption Due to Bad Bounds Checking in NSCharacterSet Coding for NSKeyedUnarchiver Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1168 The dump today has this list of iOS stuff: https://wikileaks.org/ciav7p1/cms/page13205587.html Reading through this...

Apple macOS/iOS - Memory Corruption Due to Bad Bounds Checking in NSCharacterSet Coding for NSKeyedUnarchiver

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1168 The dump today has this list of iOS stuff: https://wikileaks.org/ciav7p1/cms/page13205587.html Reading through this sounded interesting: """ Buffer Overflow caused by deserialization parsing error in Foundation library Sending...